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| author | Zhe Qiao <qiaozhe@iscas.ac.cn> | 2024-07-31 11:45:47 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-11 13:35:59 +0300 |
| commit | d7ccf2ca772bfe33e2c53ef80fa20d2d87eb6144 (patch) | |
| tree | 85955347fd48af96e7fc7c480fadcfecbfb68d30 /arch/riscv | |
| parent | aa0f864052d041773c8c3fed1080c5207a1fba74 (diff) | |
| download | linux-d7ccf2ca772bfe33e2c53ef80fa20d2d87eb6144.tar.xz | |
riscv/mm: Add handling for VM_FAULT_SIGSEGV in mm_fault_error()
[ Upstream commit 0c710050c47d45eb77b28c271cddefc5c785cb40 ]
Handle VM_FAULT_SIGSEGV in the page fault path so that we correctly
kill the process and we don't BUG() the kernel.
Fixes: 07037db5d479 ("RISC-V: Paging and MMU")
Signed-off-by: Zhe Qiao <qiaozhe@iscas.ac.cn>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240731084547.85380-1-qiaozhe@iscas.ac.cn
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/mm/fault.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c index 274bc6dd839f..05d7d3647964 100644 --- a/arch/riscv/mm/fault.c +++ b/arch/riscv/mm/fault.c @@ -60,26 +60,27 @@ static inline void no_context(struct pt_regs *regs, unsigned long addr) static inline void mm_fault_error(struct pt_regs *regs, unsigned long addr, vm_fault_t fault) { + if (!user_mode(regs)) { + no_context(regs, addr); + return; + } + if (fault & VM_FAULT_OOM) { /* * We ran out of memory, call the OOM killer, and return the userspace * (which will retry the fault, or kill us if we got oom-killed). */ - if (!user_mode(regs)) { - no_context(regs, addr); - return; - } pagefault_out_of_memory(); return; } else if (fault & VM_FAULT_SIGBUS) { /* Kernel mode? Handle exceptions or die */ - if (!user_mode(regs)) { - no_context(regs, addr); - return; - } do_trap(regs, SIGBUS, BUS_ADRERR, addr); return; + } else if (fault & VM_FAULT_SIGSEGV) { + do_trap(regs, SIGSEGV, SEGV_MAPERR, addr); + return; } + BUG(); } |